BS ne uk be | 
Double-Stars discovered by Alvan G. Clark. 283 
The remarks on this subject are rendered more interesting 
and conclusive by their correlative application to the animal 
kingdom. There is between the modifications of animal and 
at the end of the Eocene, and there also have been found the 
bones of Xiphodon, prototype of the Giraffe, which in its pres- 
ent form appears later in the Miocene in its migrating pro- 
gress from France to Africa. It is at this epoch of the Upper 
ocene that mammals make their first appearance in Europe, 
an advent prepared and predicted by the luxuriance of the 
vegetation of the Lower Eocene. 
Columbus, 0., January 23, 1879. 
ArT. XXXIV.—Double Stars discovered by Mr. Alvan G. Clark ; 
by S. W. BurnHamM. 
bowski and myself. All of the latter measures have been 
made at the Dearborn Observatory, Chicago. 
